Effective Size of Subpopulations in Early-Run Sockeye Salmon Oncorhynchus nerkafrom Azabach'e...
Efremov, V.; Parensky, V.
2004-10-18 00:00:00
Using Parensky's approach for estimating the number of breeding pairs, we determined effective subpopulation size N
e in early-run sockeye salmon Oncorhynchus nerka from Azabach'e Lake (Kamchatka) in 1977 through 1981. On average (over years and populations), biased sex ratio decreased N
e by 7% as compared to the number of fish on the spawning sites (N
i). High density reduced the N
e /N
i ratio by 62–66% because some fish were excluded from spawning. Dominance polygyny as compared to monogamy and random union of gametes could reduce N
e by about 17%.
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